* {
  margin: 0;
  padding: 0;
}
html,
body {
  font-size: 20px;
  height: 100%;
  width: 100%;
}
.music {
  width: 100%;
  height: 100%;
  color: #fff;
  position: relative;
}
.music::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: block;
  filter: blur(4px);
  background: url("https://i.loli.net/2021/05/09/13r2KECdioq8gbP.jpg");
  background-size: cover;
  overflow: hidden;
  z-index: -1;
}
